Cool thing I did today

I have my Tacx Flux 2 fluid trainer that I have been using. Mostly in the erg mode set the power and pedal you ass off. Sometimes I will bypass this and just use my Garmin 945 and hit free ride. This pretty much means that you are in the non erg mode.
Today I uploaded a real ride I did out side to the watch. Then using the Garmin 945 I choose the option "follow the course." And sure enough it did exactly that and just like the course the resistance changed on the hills up and down. It was pretty good to see you do compared to real activity.
Comparison against the real ride I did on Strava. The Strave ride shows much less power and I think in general Strava for me in the flatland underestimates power. My power was 124 today and on the real ride only something like 96.
Also, am I the only idiot that finds riding out of the saddle on any indoor trainer is frankly awkward and not worth the effort. I am not a Zwift user or any paid subscription. I find just riding trainer with metrics enough.
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Deacon Mark